Secure Element Authenticated Encryption with Additional Data#

Authenticated Encryption with Additional Data (AEAD) operations with secure elements must be done in one function call.

While this creates a burden for implementers as there must be sufficient space in memory for the entire message, it prevents decrypted data from being made available before the authentication operation is complete and the data is known to be authentic.

Modules#

psa_drv_se_aead_t

Typedefs#

typedef psa_status_t(*
psa_drv_se_aead_encrypt_t)(psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_plaintext, size_t plaintext_length, uint8_t *p_ciphertext, size_t ciphertext_size, size_t *p_ciphertext_length)

A function that performs a secure element authenticated encryption operation.

typedef psa_status_t(*
psa_drv_se_aead_decrypt_t)(psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_ciphertext, size_t ciphertext_length, uint8_t *p_plaintext, size_t plaintext_size, size_t *p_plaintext_length)

A function that peforms a secure element authenticated decryption operation.

Typedef Documentation#

psa_drv_se_aead_encrypt_t#

typedef psa_status_t(* psa_drv_se_aead_encrypt_t) (psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_plaintext, size_t plaintext_length, uint8_t *p_ciphertext, size_t ciphertext_size, size_t *p_ciphertext_length) )(psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_plaintext, size_t plaintext_length, uint8_t *p_ciphertext, size_t ciphertext_size, size_t *p_ciphertext_length)

A function that performs a secure element authenticated encryption operation.

Parameters
[inout]drv_context

The driver context structure.

[in]key_slot

Slot containing the key to use.

[in]algorithm

The AEAD algorithm to compute (PSA_ALG_XXX value such that PSA_ALG_IS_AEAD(alg) is true)

[in]p_nonce

Nonce or IV to use

[in]nonce_length

Size of the p_nonce buffer in bytes

[in]p_additional_data

Additional data that will be authenticated but not encrypted

[in]additional_data_length

Size of p_additional_data in bytes

[in]p_plaintext

Data that will be authenticated and encrypted

[in]plaintext_length

Size of p_plaintext in bytes

[out]p_ciphertext

Output buffer for the authenticated and encrypted data. The additional data is not part of this output. For algorithms where the encrypted data and the authentication tag are defined as separate outputs, the authentication tag is appended to the encrypted data.

[in]ciphertext_size

Size of the p_ciphertext buffer in bytes

[out]p_ciphertext_length

On success, the size of the output in the p_ciphertext buffer


Definition at line 736 of file util/third_party/mbedtls/include/psa/crypto_se_driver.h

psa_drv_se_aead_decrypt_t#

typedef psa_status_t(* psa_drv_se_aead_decrypt_t) (psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_ciphertext, size_t ciphertext_length, uint8_t *p_plaintext, size_t plaintext_size, size_t *p_plaintext_length) )(psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_ciphertext, size_t ciphertext_length, uint8_t *p_plaintext, size_t plaintext_size, size_t *p_plaintext_length)

A function that peforms a secure element authenticated decryption operation.

Parameters
[inout]drv_context

The driver context structure.

[in]key_slot

Slot containing the key to use

[in]algorithm

The AEAD algorithm to compute (PSA_ALG_XXX value such that PSA_ALG_IS_AEAD(alg) is true)

[in]p_nonce

Nonce or IV to use

[in]nonce_length

Size of the p_nonce buffer in bytes

[in]p_additional_data

Additional data that has been authenticated but not encrypted

[in]additional_data_length

Size of p_additional_data in bytes

[in]p_ciphertext

Data that has been authenticated and encrypted. For algorithms where the encrypted data and the authentication tag are defined as separate inputs, the buffer must contain the encrypted data followed by the authentication tag.

[in]ciphertext_length

Size of p_ciphertext in bytes

[out]p_plaintext

Output buffer for the decrypted data

[in]plaintext_size

Size of the p_plaintext buffer in bytes

[out]p_plaintext_length

On success, the size of the output in the p_plaintext buffer


Definition at line 778 of file util/third_party/mbedtls/include/psa/crypto_se_driver.h